Having some problems with my Parker SRB

I bought it from Amazon and I'm currently disinfecting it. I there was some black powder on it and I'm looking to get rid of it. Its also on the part of the razor that has the screws inside attaching it to the handle. What can I do? Can I disassemble it disinfect it and re attach it? It's a plastic handle with some screws or whatever is holding it in place.

I believe that's a disposable blade straight razor-- I'm assuming isopropyl alcohol should work, but it may be easier to just replace the blade.