I took the ladder out in preparation for closing. The bottom of the rungs were pretty well coated with algae. This is probably partially due to the ladder not being cleaned before putting it in for the season- I didn't know any better at the time. I sprayed it with bleach and hosed it off, but there is still a texture to it that scrapes off with my fingernail- I can't tell if it's the fiberglass degrading or dead algae that built up over the years (does this even happen?). Anyways, the rungs are molded with many X patterns, which would be very difficult to clean. Will spraying with bleach and hosing off be sufficient, along with storing in a dry place for the winter, or does it really need scrubbed?