I need a eye catching idea for a postcard. I am starting with a new construction cleaning service and I don't know what will be really the best way to advertise my sevices. I am planing on sending this postcards to contractors/builders. Please any ideas will be greatly apreciated.

I would like to use a custom cartoon character with a good phrase. they say the cartoon characters is the best way to abvertise with but I do not know if this true and will work.

what do you think?
have you done this before??

thank you
Mary