These rods have a memory. They can be bent in a 90 degree angle and will stay that way. They are flexible enough to tie in an 8" diameter knot.
With steel fitting.

Optional

Clean Storm 20230809 Air Duct Cleaners Basic 60 Gallon Air Compressor Starter Bundle 13.1 CFM Dual 120 Volts 16 Amps  No gasoline needed.