I once had a well meaning guest Guest's son ruin a bimini by scrubbing
it with harsh (laundry) soap. It was never quite the same. No amount
of Scotch Guard ever made it as waterproof as it was.

I was reading where "Simple Green" is too harsh. I have been using
diluted Simple Green in the past. Maybe there's something better.

I can recomend a product called "Plexus", a protectant and sealer, for
plastic windows and does a good job. But isn't a cleaner.

Thanks