Verbiage in Lease about obligations to for exterminator?

[Steve S.]

I typically have the exterminator out before the new tenants move in as part of turning my properties. 

Once they’ve moved in, if they see bugs or a **** Roach etc, do you put anything in your lease about who’s obligated to pay for an exterminator coming back out?

I’d like to improve my lease with some verbiage around this as it’s pretty silent on the topic. 

Any suggestions?