Sachets of Mirazyme microbial cleaner are supplied with every Viking dry suit, and these can be used to clean the inside of a dry suit to remove body odours etc.
The exterior of a rubber dry suit may be cleaned by applying a basic solution of warm soapy water. Make sure the soap you use is a non-oil based product.
If heavily contaminated, then Simple Green is an effective degreaser which is non-toxic and biodegradable.
A solution of between 5 – 7% bleach and water will kill most biological contaminants.
Trilaminate dry suits are more tricky to clean due to the knitted or woven surface. Warm soapy water would be the best method of cleaning.