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You could have-
dirty contacts on the switch inside the pedal
dirty contacts in the jack the pedal cable plugs into
a cold/loose solder joint where the cable connects to the plug or to the switch.
If you rule those all out it's an internal problem with the pedal, which you can check by using another pedal, or it's internal to the P90, which will need to go to the shop.
NEVER use de-oxit in a volume control potentiometer !!! Use it ONLY on metal switch contacts.
De-oxit will destroy the lubrication in pots and the resistance element.
You MIGHT try CRC226 which is safe to use. It is available at Home Depot in the electrical dept. Blue can, about $2.75. Make sure it is CRC226 as there are other CRC products there which are not applicable.
The volume control may be damaged now and may need replacement. They are not expensive other than the labor to install it.
Santana's had quite a few guitars, take your pick:
1972 - Gibson Les Paul / Gibson SG Special with Humbuckers / Gibson L-6S
1975 - Gibson SG Special with P90 pickup (Woodstock Festival)
1976 - Yamaha SG 175B / Gibson SG Special with 3 Open Coils
1982 - Paul Reed Smith (PRS) Custom
1988 - PRS Santana II with PRS Santana III nickel-plated pickups and .009-.042 D'Addario strings