blocked u-bend

the missus bought the little un a play sand pit and decided to wash it out in the bath!! :Angryfire

so how do i remove sand from a blocked u-bend without dismantling the bath?

(its a bit awkward to take the bath panel off).

TIA

Old fashioned plunger maybe, I have used this also
302 Moved Temporarily
Very good

bought a plunger today and it did the trick..
got to say was surprised, thought wet sand would be far too heavy for a plunger to move..

sorted now anyways..

nice one @manic01