I feel really bad, but it wasn't my fault?

okay so i went to visits my horse today, he was really hyper so i had to lunge him for like ten minutes. then i rode him jumping for the first time (he is over 5 now) it was small like 6-12 inches and ground poles. he was really great. he was really sweaty so i was going to wash him off, i get him to the wash rack (its like three walls and cement floor so its scary, and my horse doesn't like baths) and if his life depended on it he would not go in. so i had to put him away sweaty, i tried to entice him , but it didn't work. then i decided to lightly hit him with the end of the lead rope and that didn't work, and neither does backing into it. he is deathly terrified of the wash rack now because whenever someone comes along they help me by slapping him on the and forcing him to go in which scare him even more. i would tie him there and fake him out by just grooming but now he won't even go in. i tried today for half an hour. but i had to get home. i feel bad for putting him away sweaty, will it affect him, and any tips for the wash rack. i got him to get one foot in by the end of the half hour twice and i praised him and had to give up. im thinking of just brushing him near it tomorrow and then ride, and then come back a few hours later and lay a trail of carrots up to wear you tie him then i'll groom him if it succeeds and then walk him around the wash rack until hes good. thanks for your help :))any tips??? 000000000000000000