There are 3 main ways;
(1) Locate the reset and use it, not whilst stood in there.
(2) Contact Support and ask them to reset it
(3) Open the Prop Edit and locate the icon that lists ALL of the props. Then click on each and delete them one by one. It might seem a daunting task but doesn't take as long as you think. Put some music on in the background and go for it.
Before you start, make sure you have the layout saved just in case you get the wrong one or want to put it back later down the line.
NOTE: My nick and image are from a company. That company allows people to use them both as long as they get permission and a licence. I have that and a certificate to prove it.
"These are not the Druids you are looking for..."