There should be directions on the absorbine that say how much to add to a bucket of water to use a sa body wash. It is not a lot. I would be sure to brush him off really good, rinse with cool water if available make sure he is drinking enough and make sure he finishes any supplements. If he is in good condition he should be fine. I used to ride my gelding ( 25 + yrs ) on mtn rides and I just really brushed him good let him roll after rides. Of course he got his goodies.