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 *** 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.