Need to scrub out my Penderfeed creep shelter. Tried throwing water in and waiting ages for the water to drain out the tiny drain holes but there's still crud in the trough bit. Thinking now is a) dismantle or b) employ a very small person or contortionist

. Could maybe tie an extension pole to a (new) loo brush lol. Any tips? Could turn it on its side I suppose but will need to drag hubby out to help

?