Jay McKray was responsible for the incident as he took revenge on Harry for his shopping list prank, which involved replacing all their requested food with food colouring, cereal and bananas.
Harry fumed at Jay, Aden and Anton over the incident and he was backed up by fellow housemates Aaron, Alex and Tom, who claimed the second prank was "out of order".
Ranting at Aden, who walked into the bathroom when Harry was cleaning up the mess, the 22-year-old said: "Aden, don't even bother coming in here. Just f**k off now. Ads, you're a d**khead. You know who did it and you're a part of it.
"We all know who it did and we all know who his little henchman is... It doesn't take much to know it was Tweedledee and Tweedledum, does it?"
"Mate, you're a d**k. You're an absolute f**king idiot. You were one of my closest friends in here. Now you're not... you were one of my closest mates, you're not anymore. And I mean that from my heart."
As Anton attempted to deny responsibility, he swore on his mother's life that he wasn't to blame.
An angry Harry replied: "I don't care about your mum and I don't care what you're saying."
Harry also took a swipe at Jay's love interest, Louise Cliffe, commenting: "It's funny how little Miss Supermodel sticks by her boyfriend, doesn't it?"
Later in the night, Harry and Jay attempted to resolve their differences and hugged in the bedroom. "I'm sorry, at least you've got bananas," laughed Jay.
Maisy and Faye face the public vote and possible eviction from the Big Brother house this evening.
Watch the ketchup and food dye incident below: