Can you tell me how to clean the striking unit on my furnace. Every year because of the dust that gathers, I have to pay someone to do this. One tech told me how, but I do not remember. Due to the venting of our furnace it is an ongoing issue and does not warrant the $$ of the cleaning yearly.

You might have better luck with this if you post it in the heating and AC board:

https://www.askmehelpdesk.com/heating-air-conditioning/