Well BB,
Since no one jumped on this one, I'll toss in my two cents. I think I'd find a convenient time when no one will be using the pool for a day or so, raise the Cl to shock and pull the cover over the pool, maybe even submerge it to get the pool water over it all and maybe even brush it with the pool brush.
I'd expect to have to do some clean-up after but if it's otherwise clean, I think most of the algae would filter out.
HTH
Chuck
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