Hey Mate
1 Take the carby of
2 Get carby cleaner to generally clean the carby while your there .
3 Fina clean place where you can take it apart.
4 Take the float apart. I think there is no need to take the jets our.
Get your hands on some compressed air.Your local mechanic or YOu can buy a bottle at office works .And blow the carby weill ..Take the main needle out.
The carby will be as good as new when your done.
I never cover anything while I clean my bike. Sometime i even keep it running

Never problems.But yeah a plastic bag works a traet cover your cdi,Voltage regulator ,and relay if you can be bothered.
Cheers
VAdim
Elstar