You make a foam fitted vinyl covered plug for the scoop intake hole for when you wash it. We have fitted plugs for the intakes and exhausts on the aircraft when they are in storage or being washed. Complete with remove before flight tags.
Any decent fabric or Hobby Lobby will have good quality foam for a nice scoop plug. That's what I used on my 65. I had a Max Wedge scoop on it. Made a nice foam plug. Worked real nice.