Mr. Clean Magic Eraser - truly magic
I didn't find any posts with the direct subject of this amazing product so I had to write one.
Up here in BC trailers get mildewy. Doesn't matter how well you cover it in the spring there are little bits here and there and it gets into the fine holes where the fiberglass isn't quite perfect. As well, any metal contact puts a black wash on the fiberglass that is brutal to take off.
I have tried a bunch of techniques including borax, poliwash and baking soda, tried green pads, foam pads etc.. but I couldn't find anything that took off some stains from the front window sealant. Magic eraser did it in just a few swipes. I wouldn't want to do a whole trailer with one but for those little things you want to get out before you wax it's perfect.
Unfortunately it doesn't do anything for the alumnium smears, have to use a polish for that.
Hope that helps for people searching for clean up products.