If the outer surfaces are severely oxidized, pretreating with DeoxIT first is recommended. Apply a few times until clean and then apply ProGold as the final step. This is more of an applicator question. For contact surfaces that are not readily accessible using a spray or needle dispenser might be the best option. Apply one short burst, then wait a few minutes and apply one more quick burst.
Small amounts are only necessary.
Operate the switch to distribute the fluid and displace the contamination. They are all different formulations and will not work better if mixed. They, however, can be used in conjunction with each other. The following is a brief explanation on how to use the products. Contact a CAIG technical representative for specific information on your application.