Would the value of the remodel increase the rents or the selling price that would out weight the cost? 

However, hauling away a truckload of items and cleaning beyond standard expectations could reasonably be charged to the tenant, as it goes beyond normal use.Goodwill Gesture: Since this tenant was great for 5.5 years—paying on time and caring for the property—you might consider waiving part of the cleaning cost as a goodwill gesture.

After that make sure you have your property up to standard before placing a tenant.

The return of installing one is not 1 to 1 but will increase your properties value. 

Quote from @Basit Siddiqi: I personally would not buy real estate with a retirement account.There are just too many headaches that are not worth the potential increased return.Some headaches when it comes to investing in real estate with a retirement account1) LTV values are less and harder to find lenders.2) Potential to sell or partially distibute the property if you have to do a RMD(Required Minimum Distribution)3) If you run out of cash and have to make a major repair, you may be out of luck and have to sell.4) Having to potentially worry about UBTI(Unrelated Business Taxable Income)I would personally invest in stocks/bonds/notes with a retirement account.I buy deals with cash and use a ROTH SDIRA so there are no RMD's.I buy at huge discounts to retail.

They build, you do a standard FHA mortgage at closing once the home is completed. 

Given that the property was worth $390K in its current condition, I saw an opportunity to make the numbers work while keeping my upfront costs low.Instead of increasing my cash offer, I negotiated a $25K down payment with the seller carrying the balance for two years through owner financing.

Let’s talk about what’s holding you back and how letting go can increase your bottom line

It hedges any downside risk and increases cash flow.

A potential goldmine for those seeking to increase property value and generate rental income.However, navigating this opportunity requires strategic planning.