I use an alcohol based hand steriliser, the type they use in hospitals. I think it is mostly alcohol, so i just use it on the blade, nowhere near the scales.
I was wondering if it is possible to autoclave the wapienica razors, which are all steel. I have an 18 litre pressure cooker left over from various mycology serilisations i was doing last year, so i guess you could probably use it for an all steel razor. Just not sure if it would create tarnish on the blade at all as when i sterilised a scalpel blade it went black probably due to some aluminium foil i had in there on top of a jar.
Nick