Well, this is a zombie but I’ll bite…
I wash according to what’s on the horse that needs to be removed. Soap and shampoo absolutely removes oil (and other hydrophobic things). That is literally what it is meant to do. If the only problem is wet sweat or wet mud, that will come off with just* water. Dry sweat sometimes gets gummed up a bit with whatever else the horse has rolled on in the meantime, but the main part is just salt which will brush out dry, so first I will use dry brushing* and then follow up with water if necessary, followed by soap only where necessary (via wet rag). Dandruff and allergies that have built up get an anti dandruff shampoo, where necessary (flaky and itchy spots). Some real grossness like pee that has caked on or @#&$ pine sap gets a whole combination of solvents, like oil and let it sit for a while, then try detergent and cross your fingers. I am lucky that I’ve never had to worry about stains on a grey, so I can just leave them, as long as it’s just color it’s not a problem healthwise.
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Just water helps to have good water pressure…e.g. the EZ Wash wand, that thing is amazing and cuts hosing time down considerably. Pro tip, hold it close to the horse so you’re getting full pressure and angle the water against the fur.
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Dry methods are the good old curry, but also a dry tiger tongue sponge and air blowing. Take a “clean” horse and use the shop vac on blow and watch the dust. Also, if you use the shop vac a white saddle pad will get sweaty but won’t have dirt. Amazing.
Last note, I only wash my own hair once a week. I will water-only rinse if it’s sweaty or has too much barn muck in it (although I use a buff or bandana over my hair to minimize that). Post shampoo is definitely crunchier and frizzier than a few days later, and I don’t see any point in doing that every day and having to fix it again with conditioner…that’s just self-inflicted extra work. I try to clean asap after getting sweaty or dirty, which really makes it easier and only get the parts wet that actually need to be (if the roots are sweaty but the ends are dry, etc.). I am not a barn owner who has to be at the barn all day so some people may not have that luxury, but if you can it really cuts back on time spent washing. (And I do not smell gross. I have asked many people, some of whom are honest. I just smell neutral.)