Keep in mind that contact cleaners are most likely acid, and the oil in the WD 40 type stuff is not good for the plastic connector housing.
I like using Kontakt 60, but it should be flushed afterward to remove acid and residue.
I see that the guys at my workplace also use a series of 3 sprays from the same manufacturer.
Copied from the web:
Use in the order eg at switches, contacts, etc. (in Potis ONLY if everything else does not help anymore, say: Before everything is gone):
Kontakt 60 -> aggressive cleaning / deoxidation
Kontakt WL -> flush out Kontakt 60, generously flood !!!
Kontakt 61 -> preserves the result of previous steps and lubricates mechanically