The two heavy washes will use 20 * 2 = <<20*2=40>>40 gallons of water.
The three regular washes will use 10 * 3 = <<10*3=30>>30 gallons of water.
The light wash will use 2 * 1 = <<2*1=2>>2 gallons of water.
The two bleached loads will use an extra 2 * 2 = <<2*2=4>>4 gallons of water.
In all, 40 + 30 + 2 + 4 = <<40+30+2+4=76>>76 gallons of water will be needed.
#### 76