Gas forced furnace north Idaho 20 year old 4 plex. Furnace installed under staircase. Downstairs laminate and vinyl. Lighter beige ( kinda white) Carpet starting on staircase- hallway, 3 bdrms upstairs. Soil line entire perimeter everywhere baseboard installed and all edges of stairs - tread / riser all edges corners etc. I used a snow windshield remover brush kinda firm 8 inches long surface area of thin bristles also telescopic. Really helped with reach since your on knee.
OK the good Part I brought 3 products to the job site 1.filteration soil line remover. 2. Prochem line product. 3. GOJO from Napa.
Filteration kicked prochems ass the Gel was ideal to scrub with my snow brush. Never tried the GOJO (next time)…. I only $bought 1 last 20% didn’t come out so well I was stressing a little bit cause it worked and I wanted to be done. I also presprayed with my detergent and some citrus solv as booster on lines and used a internal spray crevice tool.