How to get blood out of sheets<br>Rinse the stain out from behind using cold water as soon as possible. Take the bed sheet off the mattress first, then rinse the stain out using cold water. Do not use hot water, as this will set the stain.
You should not rinse blood stains with cold water before taking the bed sheet off the mattress.
Rinsing the sheet before taking it off the mattress is not what is recommended. The system is fooled because it did not consider that there was a sequence to the events, i.e first take off sheets, and then rinse. 
( z1 recommend :polarity - :ARG1 ( z2 rinse :ARG0 ( z3 you ) :ARG1 ( z4 stain :ARG2 ( z5 blood ) ) :ARG2 ( z6 water :ARG1-of ( z7 cold ) ) :time ( z8 before :op ( z9 take-off :ARG0 z3 :ARG1 ( z10 sheet :mod ( z11 bed ) ) :source ( z12 mattress ) ) ) ) )