Oh you are SOOO lucky that it went down the drain! A few weeks ago my 2 angels tipped the one litre bottle of bubble bath all over my carpet! They then enjoyed running through it stamping their feet and making splashing noises. I made them sit there and clean it up with a towel (that lasted a whole 5 seconds) and then I had a laugh about it.
It could be worse. It could be like the time my 2 drew all over the carpet, walls doors of a cabinet and front door in my rental property with black permanent marker!

Maybe one day someone will invent a cabinet that children cannot get into. Then I can store everything I own in one of them. LOL

*hugs* I feel your pain.
Kids will be kids I say. At the time it is super frustrating and I go off my nut, but I'm laughing within minutes because I'm sure I did something similar when I was their age.