I’d like to replenish this.2.

On your balance sheet you already spent money to acquire the asset to using that asset to replenish your cash is reasonable business accounting measures.  

It further mentions that the agent can withhold rental income on a monthly basis, as necessary, to restore the full contingency reserve.While I understand the concept of a contingency reserve for unexpected expenses, the idea of withholding rental income to replenish the reserve is new to me.

I mostly see borrowers using HELOCs for a down payment or to buy a property in cash and do delayed financing to replenish their cash stores. 

When I replenish the supplies in the unit from the basement extras, I add the items to the grocery list in Grocery IQ which gives me a few months to replenish the basement supplies. 

Also, making a house visit (prospective tenant's current rental) as part of your screening process would give you a pretty good idea of what your place will look like after a few months.Here's one clause to cover the bases on cleanliness:Tenant(s) are expected to keep premises clean during tenancy on a continuing basis and if not done to Landlord's satisfaction, costs for cleaning or repair/replacement may be deducted anytime from the security deposit with a 30-day deadline for tenant to replenish.

We go out and visit from time to time to replenish. 

It takes time to make sure all the furnishings are not missing, still in acceptable condition and items that need replenishment & cleaning are addressed. 

It gets replenished as needed.

But if this were to happen, well, then I'd have to replenish that fund asap and hold off on buying something until I am back on track.