Hi Connie,
It depends on a few factors. For example, do you also live on the property or is it strictly an income property? Though one can`t exactly evict on lack of cleanliness, if it`s something extreme perhaps you can try the N5. This one is for "wilful" or "negligent" whether they meant to or not. Read the instructions and forms here:
http://www.ltb.gov.on.ca/en/STEL02_111286.html
(1) Form N5 is for “wilful or negligent damage”; Form N7 is for “wilful damage”
(2) Form N7 may be appropriate if the landlord lives in the same building as the tenant and the building has 3 or fewer residential units
Since you didn`t go into specifics, if there`s potential major damage like they leave water running and potential flooding, or leave food out that attracts rodents, bugs, encourage mold growth, etc.
Well, good luck but yes, caution like the person above poster commented.