The right conditioners can wash grease just as well as any shampoo, I strip out a heavy coconut oilling no problem. Many will tell you co-washing is better for oilings than shampoo
Plus they don't strip and irritate the scalp as much as certain shampoos - sulphates, olefin sulfonates, anything alkaline - so sebum production can be reduced. Mine reduced the first week, but some take some weeks to adjust.
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
CO-wash: Inecto coconut
Treatments: Komaza Matani, coconut oil, Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume, Inecto argan
Styler: Umberto Giannini jelly, Boots Essentials gel
Experimenting with: going back to basics