Honestly I'd recommend saving your money (Please don't hate me BiggerPockets) and developing the calculator on your own in excel you'll learn so much more, and it really is just as good, it just isn't as polished. 

OK you might lose a month or 2 in rent and some cash to polish the place but that might more than pay for itself in the selling price.

I'm polishing up my scripts and presentation right now.

I'd only heard about home hair dye that women use in the shower.Is that hair dye or shoe polish?

Also make sure you have a polished professional website and email with domain name.That being said if you want to send a letter make sure to use a real stamp, professional letter head and good quality paper.

Polish your mind and body, and gym does both.

It is YOU that need to better your marketing psychology and your message resonance.Solution:Get a solid website going that shows you are credible, that is polished professional and inviting/enticing to read.So,  know the difference between (YOUR) opinion, and facts.

I've had to toss lots of contractors and have accepted a good bit of work that I now see was substandard, and have come in behind them and polished up.  

For example, one I've done is on things like rebar and steel plates in the slab.Honestly the bottle-neck is my desire for them all to be fairly polished.

Again, I thought we were looking at a relatively straightforward minor repair and polish job.