I put a squirt bottle cap on a bottle of Seafoam, for just that purpose.
Hold the choke open, squirt a bit of Seafoam in and crank the engine over (while squirting). Let stand about an hour or two, and it'll probably start right up.
I learned this when I let my spare 5500 set for three months with gas in the carb. I run it dry now after testing.
2005 Georgetown 342DS XL, Full Banks Package
2005 Liberty Renegade 4X Toad
1989 Wrangler Sahara Toad
1984 19.5' Beachcraft i/o 5.o liter, 4-bbl (and you thought your Moho sucked gas!)
D/W Carole and Maggie the Teacup Lab (Black Chihuahua)