i think if your able bodied ofcourse if you look more in the direction of a professional pump up spray or battery powerd one from the factory cleaning industry . i used to work cleaning a chicken factory at night and they had back pack sprayers that last ages even if you pump them up . there is probably electric ones to bye now as this was awhile ago ie 20 years at least . i hope this helps .

I have a Cepia 1-touch One Gallon Multi-purpose Power Sprayer, I got mine in Abergavenny market for £5 last year but they have them on Amazon, it does the job but the pump does whine a bit. Hope this helps.