I Almost Rejected Chemical Guys Tire Shine and a 70mai Jump Starter—Here’s What I Learned

Last March, our purchasing manager wheeled a hand truck into my office. Three cardboard boxes sat stacked on it, each with a packing list taped to the side. “They’re all here,” she said. “Can you do your quality check before I schedule the fleet work?”

I’m the quality and compliance manager at a small equipment rental company. That title makes me sound like a desk jockey, but half my day is on the floor with a flashlight and a tape measure. We run about 40 scissor lifts and a small fleet of service trucks that do roadside repairs and customer deliveries. Any downtime means lost revenue, so when a maintenance order comes in, I treat it like a preflight checklist.

Over the past four years, I’ve reviewed roughly 60 deliveries annually. I’ve rejected my share of first shipments—about 15% in 2025—for spec mismatches, missing certifications, and once for a batch of wipes that arrived with the seal broken on every single canister. So I don’t take a box of products at face value.

This order had been assembled by our shop manager and ops lead. It was supposed to cover two things: making our service trucks presentable for customers, and prepping the maintenance bay for winter. The boxes contained:

• A gallon of Chemical Guys tire shine
• A case of Chemical Guys leather quick detailer wipes
• One 70mai jump starter Midrive PS01
• A roll of drip diaper for scissor lift maintenance

It looked reasonable. The shop manager had spent an evening searching for “best Chemical Guys tire shine” and chose a gallon based on a review that promised a high-gloss finish. The leather wipes were supposed to keep the truck interiors decent between jobs. The 70mai jump starter was going to live in the dispatch office for rescue calls. And the drip diaper was meant to keep the concrete floor clean when hydraulic systems needed work.

My tests failed—or so I thought

The next morning, I decided to run a few tests. I didn’t tell anyone. I wanted to verify the products did what the labels claimed. And honestly, I wanted to justify the purchase order.

First, the tire shine. I’ve always believed that if a product is good for tires, it should be safe on other rubber parts. So I applied a little to a rubber seal on one of our scissor lift arms. It dried slick and greasy. “This is going back,” I said.

Then the leather wipes. We have a service truck with seats that have seen better days. I grabbed a wipe and rubbed hard on a dark stain. The grime moved around, but it didn’t lift. “Quick detailer, my ass.”

Next, the 70mai jump starter. I plugged it into a standard USB port on my monitor because the box didn’t include a wall adapter. After two hours, the LED still showed 60%. I pulled out my phone and typed “how long does it take to charge jump starter” into the search bar. The answers disagreed with each other. I concluded the device was defective.

Finally, the drip diaper for the scissor lift. I laid it on the concrete floor, poured a cup of hydraulic oil onto it, and watched the oil run off the edge. “Not even close to absorbent enough,” I wrote in my notes.

Four out of four products failed my inspection. I was already drafting a return request.

The upside of rejecting the order was clear: I’d send a message to our new supplier that we don’t accept sloppy products. The risk was less clear, but it was there. Two scissor lifts were scheduled for maintenance the following week, and the drip diapers were part of our floor safety plan. The service trucks were also due for customer handovers, and the tire shine was on the checklist. Rejecting the whole order would have delayed at least one rental—and that delay would cost real money. I nearly hit “send” on the return request anyway.

The phone call that changed my mind

Our contract required vendor approval before returning anything above $500. The whole order was well over that, so I sent an email to the supplier. I expected a fight.

Instead, a tech rep called me the next morning. He was polite. He asked me to describe the tests I’d run. I did. Then he asked, very carefully, “Can you tell me what each product is designed to do?”

I opened the product manuals and labels he emailed me. The tire shine label said: “For exterior rubber and trim. Do not use on belts, hoses, or seals.” The leather wipes label said: “For quick maintenance cleaning and surface refresh. Not a heavy-duty cleaner.” The 70mai manual included a table of charging times. With a 5V/2A adapter, the Midrive PS01 takes about three hours to charge from empty. With a low-power port, it can take longer. And the drip diaper spec sheet said it’s designed for catching slow leaks and drips during maintenance—not for containing a deliberate pour.

“I understand why you tested them the way you did,” the tech rep said. “But a tire shine isn’t a seal conditioner. A quick detailing wipe isn’t a shampoo. And a drip diaper isn’t a spill kit. If we’re going to work together, we need to be clear about that.”

He wasn’t defensive. He was right. That honesty—saying “this isn’t what this product is for”—earned my trust more than any guarantee would have.

I sat there for a second. Four years of reading specs, and I’d made the exact mistake I criticized in vendors: expecting one product to be everything.

What I do differently now

We kept the order. Not because the supplier convinced us, but because we finally matched the products to their intended jobs.

The Chemical Guys tire shine, used properly, gave our service trucks a clean, professional finish. Not high-gloss overkill, but respectable. The Chemical Guys leather quick detailer wipes became the go-to for between-job wipe-downs. Fast. Easy. No residue. And the 70mai jump starter sat in the dispatch office, charging overnight. Two weeks later, it brought a diesel service truck back to life at a cold job site. The drip diaper did what it was supposed to do—we tucked it under a scissor lift during a hydraulic repair, and it caught the slow leak without turning the floor into an oil slick.

As for the charging question that started my rant: the honest answer is that it depends on the charger. For the 70mai Midrive PS01, plan on at least three hours from empty with a good 5V/2A adapter. Use a weak USB port, and it’ll take longer. The manual doesn’t promise fast charging; it promises reliability. That’s the spec that matters.

If you ask me, one-stop sourcing is only as good as your willingness to read the fine print.

Since that day, I’ve added a line to every purchase specification: “All products must be used for the purpose described by the manufacturer.” It sounds obvious. But in one afternoon, I’d been ready to reject an entire order because I expected the wrong things from the right products.

A good quality inspector doesn’t just ask whether a product meets the spec. He asks whether the spec meets the need. And sometimes the person who needs to be inspected is me.