If what you are going to do is to polish the brass ashtrays, you may read the procedure here: https://etravelweek.com/imported/polishing-brass-ashtrays.
1)Remove any debris from the top of the ashtray.
2)Take the top off the ashtray and remove all rubbish from the tube.
3)Wipe the tube, stand and top of the ashtray with a damp discarded cloth.
4)Replace the ashtray in its original place.
Why must the ashtrays be emptied regularly?
What should you do when you pass an ashtray?
What should you do if the rubbish does not come out?
After wiping the ashtray, on what other items can this cloth be used?
Ashtrays are used frequently by guests, not only for cigarette ash, but for anything they have finished using such as drinks cartons, gum, paper etc. It is for this reason that they have to be checked, emptied and cleaned regularly.
Every time you pass an ashtray (with or without your trolley) and it has something in it – remove it!!
Place a long object, such as a metal coat hanger into the tube to help release any objects that will not come out.
It is very important that the cloth used to wipe down an ashtray is used for ashtrays only as it will smell of ash.
It is only necessary to empty the ashtray in such a manner once a day. After that one time, ensure that the top of the ashtray is clear and wiped regularly throughout the day.
In hotel, deep cleaning and maintaining brass items is usually outsourced. Though you may do it yourself sometimes to save time and cost with the following steps.
Use only water and mild detergent to clean brass-plated items, as anything more abrasive could damage the plating.
Lacquered brass can be cleaned simply by wiping with a damp cloth.
Cleaning non-lacquered brass requires more elbow grease:
Ketchup: Squirt some ketchup on a clean cloth and rub over tarnished brass. Then wipe clean with a damp cloth and buff dry.
Soap or Mild Detergent: If your brass item is dusty or dirty rather than tarnished, submerging it in warm soapy water and cleaning with a soft cloth could do the trick. Use a toothbrush to gently scrub extra dirty areas.
Vinegar, Salt and Flour: These versatile home staples can be combined to make a paste to clean tarnished brass. Dissolve 1 teaspoon of salt into one-half cup of vinegar, and add flour until the mixture becomes a paste. Rub into the brass, leave for about 10 minutes, then rinse with warm water and buff dry.
Water: Heat a pint of water, and add 2 tablespoons each of salt and white vinegar to create another natural recipe for polishing tarnished brass. Rub the mixture onto the brass, then dry with a clean rag.
Lemon Juice: Straight lemon juice can be used to clean brass and bring back shine. After cleaning with lemon juice, wipe with damp cloth and buff dry.