In the cause of science I decided to put the claim that Pledge household polish is good on cars to the test. I know some of you thought I was being brave, but here are my findings. I bought Pledge Classic multi surface spray polish. For those who don't know my car is already quite shiny and protected so I decided to clean half of my bonnet, a bumper, a wing and a door with Pledge and leave the rest of the car protected with AutoGlym Resin Polish in order to be able to compare. The Pledge needs applied in very small quantities as a little goes a long way. I spread the polish (having sprayed a little onto a cloth) then buffed it up with a clean cloth. The immediate results were impressive because the paint looked completely clean and had a non streaky finish and a very good shine. I tested out the finish by asking family members and no one could tell which side was AG and which side was Pledge. So the immediate result was excellent because the £3 can of Pledge produced a good finish and with very little effort. Unlike your furniture though , your car gets driven around and gets wet and dirty. When I washed the car both sides washed just as easily and both dried OK, however, I think the Pledge finish was less durable and I needed to reapply it to maintain the shine. When reapplied the shine was good but whereas the Super Resin Polish hides small imperfections and scratches the Pledge side didn't. Given that all the car was already polished with AG before I started this test, I realised that the Pledge was cleaning the surface and removing the AG and therefore the scratches were more visible on the Pledge side than the AG Only side. I also used pledge on the headlights and exhausts and I have to say it was very good on shining up both. Conclusion; Using Pledge on your car will not make your car dissolve and turn it Pink. As a quick fix it will produce a good finish which is streak free as long as you don't use too much polish. It is very good on headlights and exhausts and I will continue to use it on both. It is pretty good on painted plastic like bumpers (why that should be different from painted metal I don't know). However, on paint it is not as good as AG as it cleans surfaces revealing marks hidden by a good polish. I also suspect that multiple coats will go streaky over time. When the experiment was finished I washed my car twice and the reapplied AG SRP all over it. The Pledged surfaces required more buffering as I guess there was Pledge residue. A freshly polished AG surface is shinier and looks better, in part because it has fillers in it. So should you use Pledge on cars? Yes- on lights and exhausts, Yes- to remove water marks, which it is good at, Yes- as a quick detailer or Yes if you can't afford better or don't have the time to perfect a shine. However, it is not a filler, it is not as durable and it will periodically need cleaned off or else I suspect it will get streaky and messed up. It's OK as far as it goes but I'm pleased to get back to my AG finish. HTH.