Best way to clean and test this resistor?

[BrugeeRT]

This is the resistor from the heater box.   What is the best way to clean the rust?   Little wire wheel on a dremmel?  I could sand blast just the connector but then I am guessing I would need to put some protectant on it somehow.   Any way to test this thing?

Thank you.   

[Nacho-RT74]

Dip it into vinegar or lemon juice.

A failed heater-A/C resistor block would be really noticeable. Don't worry.

[b5blue]

I use this on all connections everywhere. https://caig.com/deoxit-d-series/   

[jlatessa]

Don't forget to neutralize the vinegar after you dip the part, water will work.

Joe

[Nacho-RT74]

With baking soda to neutralize even better

[66FBCharger]

I use this on all connections everywhere. https://caig.com/deoxit-d-series/   

These are great products! We use them at work. I used them on my bulkhead connectors.
John

[BrugeeRT]

I appreciate all the great responses!