mold/mildew removal

I recently replaced by bed with a newer (in better shape) one. The one I replaced it with was sitting around for sometime and has mold/mildew at the top of the composite bed near the rails.

What can I use to clean it without messing up the bed (think white haze after getting wax on black plastic parts)?

 

Spray some cleaner on it and hit it with a powerwasher.

 

I think the McKee’s 37 brand has a mildew remover in their line-up.

 

Here it is...
https://www.mckees37.com/mildew-remover.html