Okay, I have drained the pool to below the level of the light fixtures, as I can see algae creeping from behind them. I plan to take them out tonight and bleach and scrub behind them before replacing. The bleach in the pool seems to be working, as long as I keep scrubbing. I'm not afraid of hard labor, but this is ridiculous- not to mention the temp and humidity in southern Louisiana right now. I think it will be easier to empty completely and pressure wash. Is there a specific type of bleach "solution" I should use to bleach wash?