I think it stands to reason (short of data) it ought to be easier to deposit debris with softer flushes...how much, isn't clear...I've also experienced having to flush a second time with the more "eco-friendly" toilets, so, I am still using the "moderate flush volume toilets".Bruce

If you want to set aside a certain amount of money do it by depositing it into an Escrow Repair Equity  Account in QuickBooks. 

I use eRentpayment.Pro's:No paperwork or depositing checks. 

Finally digging through the dol.gov, found a helpful link: http://www.dol.wa.gov/business/realestate/assistants.htmlI see that you don't need a license if you are:Property management assistantsUnlicensed assistants who provide property management brokerage services for the owner, designated broker, or managing broker may perform the following tasks and duties:Unlicensed assistants may… Deliver lease applications, leases, or any amendments.Receive lease applications, leases, amendments, security deposits, rental payments, or any related payment for delivery to, and made payable to, the owner or real estate firm.Show rental units.Execute leases or rental agreements, rental payments, or any related payment for delivery to, and made payable to, the owner or real estate firm.Act as a scrivener, completing blanks on preprinted and preapproved rental agreements with the exact language provided by the property owner, designated broker, or managing broker.

I keep a cheap receipt book in the truck if someone gives me cash for something like a deposit.  

On deposit about two weeks after listing.So sometimes it might make sense, especially on a limited budget, to check these out. 

I presume you still hold a security deposit so you could still punish them if you'd like but what if you didn't and left on good terms?

I just want to see what each person paid, (rents all the same in each house, though I they have given me different amounts in the 2 months they have been there), what they should have paid (students), what they owe, what their security deposit was. 

Do you have it in your lease that accumulated late fees can be taken out of the security deposit? 

require a sizable deposit.