[Closed] Washing up liquid in tubeless tyres?

I put new tyres on one of my bikes a while back, some non-tubeless tyres installed tubelessly using an inner tube rim strip. The front one went up easily and has been fine since day one; the rear took aaaaaages to inflate and slowly goes squidgy over a couple of days.

When the tyre gets wet you can see the air leaking through the sidewalls producing a foam of bubbles, presumably from the washing up liquid I used to get the thing to seal in the first place. Given how many attempts it took to get the tyre inflated to begin with (a lot) I started wondering how much washing up liquid there must be in there...

The identical front tyre is fine, so presumably the sidewalls of the rear tyre ought to be up to the job. That tyre went up on the first go with just a thin smear of soapy water around the bead, whereas I was practically squirting neat Fairy all over the place by the time I got the rear to inflate. Can too much washing up liquid stop the sealant (Stans stuff) working properly?