Aftermarket car maintenance products are a multi-billion-dollar industry — but do these genie-in-a-bottle extras improve your car's longevity? Worse, can an aftermarket windshield coating like Rain-X ...
We tried DIY Rain-X. Here's what happened. Rain-X is known for making water slide off your windshield, but can a DIY version do the same? We tested it so you don’t have to.
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