I've pondered getting multiple washers and or dryers for the unit or just one super unit that will speed it up for them.I've been able to make their life easier by creating a checklist and color coordinating the sheets to each room, but a choke point usually ends up being the dryer and washer itself.Based on a google search the average cost is around 1.50cents per wash and dry for a load of laundry including the detergent, going off the average bookings I have for just one of my vacation rentals I have around 65 bookings each year, with each turnover requiring around 4 loads of laundry to be washed that's $6.00 in just electric costs, not including the dryer.

You put it in the dishwasher detergent cup, instead of soap, and then ran a normal cycle with no dishes loaded. 

I heard one of them say to someone "Paul even provides laundry detergent." 

Or spill liquid laundry detergent on the carpet?

HelloBeing a manufacturer of detergents for the foodservice industry I can tell you that running a bar and restaurant is HARD.

Main thing for a septic system , NO GREASE , NO WHITE TAILED MICE , NO GARBAGE DISPOSAL . no fabric softener (dryer sheets) , and use liquid laundry detergent . 

Connect to the washing machine valve, or a faucet sometimes works (Can substitute almost anything as pressure wash detergent-that stuff is expensive)*The wife will turn your positive cash flow negative by going to Starbucks too much and there's nothing you can do about it

For those of you who provide guests with dishwasher & laundry detergent, do you provide liquid or pods?

With the modern washers put up a sign 'use Pods or 1-2 tablespoons of detergent per load.' 

The laundry room is the same thing, they leave empty detergent bottles hidden behind the washers and the laundry room is right next to the dumpster!