How to manage rental income, expenses etc bank accounts

[Jayson Hinkson]

I am seeking advice on how to manage my cash flow with my 2 rental properties.  My wife and I currently have full time jobs and I manage both the properties myself.  So far I have been collecting rents in one account and paying the mortgage out of the same account.  My question is how should I handle the expense.  I have been paying all expenses from our joint accounts and leaving the rental income in the account untouched.  So when I have to fix a plumbing issue say $300.  I pay it out of our checking account and never reimburse myself from the rental account.  Is this a bad way to manage it?  Obviously the account grows to a large number this way and right now we can handle the expenses from our salaries.  But if we get more properties I may have to change my strategy?  Any advice would be greatly appreciated.

Thanks, Jayson