( Floor ( ( must ( be ( ( rinsed ( ( ( at least ) two ) times ) ) ( to ( remove ( all ( strip solution ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Floor)) (VP (MD must) (VP (VB be) (VP (VBN rinsed) (NP (QP (IN at) (JJS least) (CD two) (NNS times))) (S (VP (TO to) (VP (VB remove) (NP (DT all) (NN strip) (NN solution)))))))) (. .)))
Floor must be rinsed at least two times to remove all strip solution.
(ROOT (S (NP (DT All) (NNS solutions)) (VP (VBP contain) (NP (QP (IN at) (JJS least) (CD two)) (NNS substances))) (. .)))