I just take a little more time in cleaning the acrylic tanks. I shut off the pumps when using the algea magnet so that any sand that may be blowing around doesn't get caught in the magnet. I change cleaning pads on the magnet each time I clean the tank. (much cheaper than getting scratches buffed out). I regularily change the plastic scraper blades. As long as you don't rush, they aren't that hard to take care of. Hope this answers your question.
LOL...that was the main reason for taking down the live cam on my 150 FOWLR which is located in my bedroom. Seems that there were some reflections off the tank......