I have a 16’ round above ground pool. Went to drain the pool the other day (after no use for about a year) and it has algae or something stuck to the sides of the liner that doesn’t seem to come off with anything but scrubbing with a magic eraser. (Which would take days to scrub the whole thing) any way I can make this faster? Also tried pressure washing but it only takes the top layer off unless I use like a 0 degree tip but that also would take forever. Any tips are welcome.