Question: What material is used for the last rinse of the duck?
About the article "Peking duck", section "Reheating".

Candidate passages:
"Kensui" (建水) is the term for the rinse-water receptacle used by the host in the tea room.
Usually made of metal or ceramic, though there are some made of lacquered bentwood.
Water that has been used to rinse the tea bowl is emptied into it.
It is kept out of sight of the guests as much as possible, being the last item brought into the tea room, and the first item removed.
While the "kensui" is a necessary item for the tea ceremony, and is among the implements the host specially selects for the occasion, it is not among the "showpiece" items the guests are expected to specially notice. 
The domestic duck, like other poultry species, has many breeds.
Most are derived from the wild Mallard, while a minority are descendants of the Muscovy Duck.
Duck breeds are officially recognized for showing by governing bodies of enthusiasts such as the American Poultry Association, which usually administer breed standards such as the Standard of Perfection.
This is list of officially recognised duck breeds: Abacot Ranger (also known as Streicher) Alabio Duck Allier Duck American Pekin Duck Ancona duck Australian Spotted Aylesbury Duck Bac Kinh Duck Bali duck Bashkir Duck Bau Quy Duck Black East Indian Duck Blekinge duck Bourbon Duck Buff Orpington Duck Call Duck Challans Campbell Duck Cayuga Duck Co Duck Crested Duck Crispy Duck Danish Duck Dendermond Duck Duclair Duck Dutch Duck Dutch Hookbill Duck East Indie Duck Estaires Duck Faroese Duck Forest Duck French White Duck German Pekin Duck Gimbsheimer Duck Golden Cascade Gressingham Duck (Wild Mallard crossed with Pekin) Havanna Duck High Flyer Duck Hoa Duck Hungarian Duck Huttengem Duck Challans Duck Chara Chamble Chara Chemballi Duck Indian Runner Duck Khaki Campbell Magpie Duck Majorcan Duck Moc Duck Mulard  Muscovy Duck Overberg Duck Pomeranian Duck Rouen Duck Saxony Duck Semois Shetland duck Silver Appleyard Duck Swedish Blue duck Swedish Yellow Duck Termonde Duck Tsaiya Duck Ukrainian Duck Venetian Duck Vit Bau Ben Duck Vouille Duck Welsh Harlequin Duck  
Wash, rinse, repeat (or lather, rinse, repeat) is a phrase or idiom roughly quoting the instructions found on many brands of shampoo.
It is also used as a humorous way of pointing out that such instructions if taken literally would result in an endless loop of repeating the same steps, at least until one runs out of shampoo.
It is also a sarcastic metaphor for following instructions or procedures slavishly without critical thought.
It is known as the shampoo algorithm, and is a classic example of an algorithm in introductory computer science classes.
In Benjamin Cheever's novel "The Plagiarist", a fictional advertising executive increases the sales of his client's shampoo by adding the word "repeat" to its instructions. 
Stop bath is a chemical bath usually used in processing traditional black-and-white photographic films, plates, and paper used after the material has finished developing.
The purpose of the stop bath is to halt the development of the film, plate, or paper by either washing off the developing chemical or neutralizing it.
With the former, a simple water rinse can be used between developer and fixer, but the development process continues (though possibly at a very low level) for an indefinite and uncontrolled period of time during the rinsing.
Where an immediate stop of development is desired, a stop bath will usually consist of some concentration of acetic acid, commonly around 1 to 2%.
Since organic developers only work in alkaline solutions, stop bath halts the development process almost instantly and thus provides more precise control of the development time.
It also cuts overall processing time, because the required immersion time in the stop bath—typically fifteen to thirty seconds—is much shorter than the time required for an adequate plain-water rinse.
As well, by neutralizing the alkalinity of basic developers, it can help to preserve the strength of the fixer, making it last longer.
Stop bath accounts for the characteristic vinegar-like odor of the traditional darkroom.
In its concentrated form it can cause chemical burns, but is harmless when diluted to a working solution.
Stop bath becomes exhausted when bases carried over from the developer cause the solution to become alkaline.
For "indicator stop bath" -- a stop bath that changes colours to indicate when the stop bath is exhausted and no longer effective -- the pH indicator bromothymol violet is used to determine when the solution has become too alkaline to use.
Low-odor stop baths use citric acid or sodium bisulfite in place of acetic acid. 
The method used in Bangladesh is as follows: an old sari is folded to make four or eight layers.
The folded cloth is placed over a wide-mouthed container used to collect surface water.
It is usually sufficient to rinse the cloth and dry it in the sun for a couple of hours.
In the monsoon seasons, it may be advisable to use a cheap disinfectant to decontaminate the material.
The preferred cloth is used cotton sari cloth.
Other types of clean, used cloth can be used with some effect, though the effectiveness will vary significantly.
Used cloth is more effective than new cloth, as the repeated washing reduces the space between the fibres.