been cleaning with wfp cold over 10 years now, just tried hot last two weeks no comparison to cold wfp.
birds poo comes off so easy, less rinsing, less water needed, and yes why who knows, quicker by about 30 % also less energy needed to clean, which is important to me
dislikes ONE hose to soft catches on wall easier, but winding in is pleasant, just need to use brain bit more when laying out the hose .
is it worth it, can you justify it .- its an individual choice, will i be up grading all my vans- YES.
should done it years ago, which system will i go for VARITECH, seems to be best available and adaptable product on market in my opinion