Basement air cleaning

[ACDNate]

Took a look at the basement air filter on my unit. P.O. replaced it with a sheet of filter type material, ie not a filter.

In looking at the coils below the "filter" they are quite dirty. Can I use conventional coil cleaner on these from the air box side?

I presume there must be a condensation drain in the bottom of the unit on that side.

[PapaRed]

You can download a document (PDF) SERVICE MANUAL FOR 6536 “-” AND “A” SERIES
TWO TON PACKAGED HEAT PUMPS at www. bryantrv.com/docs2/docs/rvp/6536heatpump.pdf or
www.rvcomfort.com/rvp/pdf_documents/1976252.pdf