Let them know you will be doing work on the property, and when you are done give a 60 day notice of rent increase.

As the old saying goes, "if you want something done, give it to a busy person".  

Went to school in Donegal, moved to Somerset.

Then it's done.

@Mian Rizwan yes it’s possible to do negative gearing however you need to have the cash to support it for 20 years.It’s also a bit of a speculative gamble as you do not know if the appreciation will be what you want.  

Why do negative signs not belong in RE, in the short term, if they’ll one day turn positive?

Another option is to give them 6 months to do it, and once it is done, give them a free months' rent (costs you $700), but the job must be completed and done properly.

Let them soak until painting is done, give them a good swish in the water and rinse them off.

What do you estimate it will cost to get those done?"

Everything from the what you expect the finished job to look like, how you want to communicate, payment schedules, everything you expect and put in on paper allong with a scope of work you want to be done.