Fairy liquid added to mortar? Criminal or not?

troffasky

Beenie wrote: »

We had a garden pond and waterfall feature installed at great expense about 15-18 years ago. The builders son used fairy liquid in the mortar for the waterfall.

The upshot is that we can't use it: every time the waterfall is on, it produces loads of bubbles in the pond at the bottom and looks stupid.

How much washing up liquid would one need to put in mortar in order for it to still be causing visible bubbles the best part of two decades later? Even if the *entire thing* was made of Fairy, it would have been weathered away by now...