Are you using a drying aid? The cars are gonna be wet on the $8 wash. maybe you include platinum but not list it
On my Istobal friction:
$8- wash(neutral shampoo) rinse, platinum, SFR, dry
$12-undercarriage, presoak/tire cleaner, lo ph tri color, wash, rinse, platinum, SFR,dry
$16 is my ceramic...