How to replace a dream lite led bulb<br>Prepare. Arrange your tools on a clean flat surface and have all your tools at hand. Make sure you have enough space to move around as well as keeping your soldering iron at a safe distance while not in use.
Your tools need to be clean to replace a dream lite led bulb
The context just says lay your tools on a clean flat surface. It doesn't say whether or not the tools themselves need to be clean. The system likely mistook saying you need a clean surface for clean tools. 
( z1 need :ARG0 ( z2 tool :poss ( z3 you ) ) :ARG1 ( z4 clean :ARG1 z2 ) :purpose ( z5 replace :ARG0 z2 :ARG1 ( z6 bulb :ARG1-of ( z7 lead :ARG0 ( z8 product :name ( z9 name :op "Light" :op "Light" ) :ARG1-of ( z10 dream ) ) ) ) ) )