MB engine clean
I can only suspect that detailers do not want to share this information due to liability issues?

However, how can one know which products to use, and to use them properly with proper techniques?
Is it simple to use P21 wash with a brush and hose down while the car is running? Some of the local MB techs have the car off and they drive off like a jack rabbit with the hood down to dry off the water.
Any input would be appreciated if you can care to share.
Pixs would be a *bonus*






