I replaced the impellers on both of mine and that isn't gonna guarantee the noise is gonna be eliminated or even reduced, but just maybe it will...it's a toss up.
Cleaning may help some, but that also not a guarantee. You just have to do your best to clean it, get parts for it (impeller) n still might end up deciding on a/c 110's eventually...I hear they're so quiet all you hear is the water running through, but don't know how true that is first hand.
I might break down and get a couple a/c 110's myself cuz this is a long term hobby...