Mine have separate toys (but that's because I buy too much
), between hamsters though I scrub the plastics and just bought new wooden ones, mainly because they had been chewed to nothing
(Cleaned with water & vinegar solution)
We're currently waiting for one of our indoor rabbits to come home from being bonded with a girlie from the rescue and I washed all the toys with water and vinager (50/50) and gave the wooden things a scrub with an old towel that I dipped in the 50/50 solution
it worked well for me when my outdoor pair were bonded so it should be fine this time too