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Been around the block on this.....will bleach dry/crack the vinyl? simple green? etc........got some stubborn mildew that has embedded in the pores on the seat fabric....any homemade or store bought concoctions?

I always use tileX

I have a pontoon, and I use a Chlorox brand product, but it's not full-strength chlorox.....it's got "Cleaner+Bleach" written across the front of the spray bottle....it works great on upholstery and everything else on the pontoon.....never had any problems with it, at all, even after 3 years of using it.

Dollar General always has a big supply of it on the shelf.

My mother in-law use the clean their boat seats every weekend with Tilex (soap and bleach). After a year the vinyl stated cracking. I don't think its a problem if you us a harsh cleaner once every now and then, but not weekly. Once you get it clean, use some vinyl conditioner/protectant to keep mildew from staining again.

Starbrite Mildew Remover and a plastic bristle brush. Then protect with Aerospace 303. Do not use mildew remover in bright sun as it dries before it can dig in and get the mildew loose.

Wesley's bleach white. Now know as blackmagic bleach white I believe. Walmart in automotive section.