Cleaning plastic furniture

Mr. Clean erasers will work well for your problems.

Simple Green and a pressure washer or hose!!

I have also seen outdoor plastic furniture cleaner at Lowes and Home Depot!

You can easily spray paint them with Rustoleums 2X for plastic .Most of the time the black will not come out over a period of time

I have a white Rubbermaid love seat in front of my garage. My daughter found it at the street by a house and brought it home. It looked like it had never been cleaned. I used and orange oxi solution I found at Home depot that was cheap but really effective on the water marks on the boat we were restoring that sat in the water a lot. If a Mr. Clean heavy duty and the liquid cleaned that off, I figured I would try it on the love seat. It now is back to what it probably looked like when it was new.

Bathroom cleaner with mildew remover works well on white plastic.

I use good old baking soda and a scrubby sponge. I make a paste of baking soda and water, let it sit (especially along the creases/lines of the plastic), and then scrub and rinse.