bathroom in French is salle de bains
Cher Les Hommes (and don't ever say mens in english, again)
You are lying is "tu mens" (singular and familiar) or "vous mentez (plural OR formal) in French.
"Utility room" in French is "buanderie".
The cloak room or coat room is "le vestiaire" (masc.) in French.
The French word for "Cindy's room" is "Cindy chambre".
To lie is "mentir" in French. You are lying is "tu mens" and a liar is "un menteur / une menteuse".
'the shower room' in french is 'la salle de douche'
You can say "J'ai nettoyé la chambre" in French.
An hotel room is called 'une chambre d'hôtel' in French.
Your room is 'ta chambre', your sister's room is 'la chambre de ta soeur' in French.
Piscime
In French, you would say "mon amour, tu me mens" to convey "my love, you're telling me lies."