New Pool owner and sick of pool shop advise!

Question... I've been doing some trial and error while I keep my SLAM going I failed after closing my auto-cover. The weird thing is I passed OCTL 3x when I left the pool open, but each time I close the cover for the night I fail.

I was thinking maybe I pour some bleach on top of the cover with water and scrub it down while it rolls up to clean it very well, or do I ignore this and stop my slam? I was trying to find some guidance searching the boards, but my googlefu stinks apparently.

How should I respond to this?
 
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