First step is to stop using the window masks that come with shells, they are always cheap vinyl and leave residue.
Get a good quality masking tape like 3M etc. even the Tamiya tape is quite good.
You could always lay the tape out and apply the window masks to the masking tape to use as a guide if you don't feel confident in doing them completely freehand whilst on the shell.
As for residue, the first thing would be to try to remove the residue with a piece of masking tape and normally works better than resorting to chemicals.
After that if no luck try some rubbing alcohol.
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