Air foma guns

How to use lematec air foam gun set?
Air foam gun kits with water wash and blowing functions, lematec made new tool set for car washing
4 in 1 Air foam gun kits, including foam, sandblaster, blow and water pressure cleaning function
LE-AS120-2, 4 in 1 Air compressor snow foam gun kits by lematec new air tool set
LEMATEC Engine cleaning gun, LE AS120, For clean car oil/dirt, engineer and conditioning...etc