I too used a small siphon blaster (speed blaster) when I did my cowl vent a few years back, FI. Here's the write-up

Southern Cab Comfort


Larry Kephart
1937 Chevy Utility Express (Deerslayer)
1955 1st 3100 Chevy (BillyBob)
2017 Cadillac ATS-V (Elvira)
Boca Raton, Florida
e-mail: [email protected]

http://www.laroke.com/larryk4674/1998/billybob.htm