Why wouldn't you use a regular cleaner and then just the Meguiars Plastic Polish?

Depends on what you call a "regular cleaner." Many cleaners for glass contain ammonia or other chemical that will degrade or fog "plastic" vert windows. Plus this is a "polish" not a "cleaner" which means it has some form of abrasive (mild) that can safely be used on plastic windows. Polishes don't need to be used every time your window needs cleaned. For "cleaning" I prefers Stoners Glass cleaner as I have found it to be the best to clean any glass surface but mild enough to use on the plastic BMW rear windows.

Has anyone tried to use this product to remove the eyeglass lens scratches?

Often plastic lens eyeglasses have a coating on them. That is softer and scratches easily. Using this product on those glasses will make it worse. It will remove the coating. Yes I have tried it and found out the hard way. However, on untreated plastic, like safety glasses, it worked fine for me.

Can this be used on a vinyl convertible window?

I used to use this on the clear plastic convertible window of an early 90's Mazda Miata I owned, and it worked beautifully. The Meguiar's clear plastic polish added a smooth shine for the final touch.

Manufacturer	Meguiar's Car Care Products
Brand	Meguiar's
Product Dimensions	16.51 x 9.14 x 3.56 cm; 240.4 g
Item model number	M1008
Manufacturer part number	M1008
OEM Part Number	M1008
Item Weight	240 g

MG#10 Plastic Polish 236 ml

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