My hamster has lots of mites but the vet can't see him for 2 weeks. Will it help if I bathe the hamster?

Unfortunately bathing is unlikely to be effective. This is because some of the mites hamsters get actually burrow into the skin and so will stay snug and safe even after a bath. Also, it's not uncommon for hamsters to have small numbers of mites which don't bother them. If your hamster has lots then it could mean your hamster's immune system is weak and not fighting them off. In this case 2 weeks is a long time to wait and your hamster needs to be seen before this. Explain the problem to your vet and see if they can offer you something earlier.