I have luck with a large pleco. Pleco will get a ratty caudal fin, but it is working for me. Just be sure the pleco is large. I started with about a 12" pleco when the male dovii was about 10". Now dovii is about 15"-16" and it is still working out. My dovii is aggressive, but not as much as others I have seen in person and on the internet. Each fish may be different, but it is worth a try. I see a little less aggression in the dovii if I keep the water a little cooler too.
Magnets and scrubbers are good for glass, but not for the other decorations, rocks, etc..