Run the machine with nothing in it. No dishes, no detergent. When it empties at the end, see if water runs clear. Put a bit in a glass and check that too.
After you’ve collected a sample, leave it on the bench to cool and then give it a vigorous stir with a spoon. If there is the tiniest bit of soap you will see it.
Done it all, I just can’t hack the soap residue
Run the machine with nothing in it. No dishes, no detergent. When it empties at the end, see if water runs clear. Put a bit in a glass and check that too.
Will do
After you’ve collected a sample, leave it on the bench to cool and then give it a vigorous stir with a spoon. If there is the tiniest bit of soap you will see it.