„Auswaschen“ ist einfach die Lehnübersetzung des englischen „Washout“. Dabei handelt es sich um eine besondere Art der Abrechnung bei Lieferverträgen, bei der die Ware nicht physisch geliefert wird, sondern die Parteien sich stattdessen auf einen Differenzausgleich einigen.

-"A wash-out is a special method of settlement in supply contracts. In these cases, the goods are not physically delivered. Instead, a difference settlement takes place between the parties.
This method is mainly used in grain and animal feed trading contracts and in oil and fat trading. Both the GAFTA / FOSFA contracts and the standard terms and conditions provide for this.
As a rule, in a supply chain, each party would pay the full purchase price to its respective seller and would receive the full purchase price from its own buyer. This is often not practicable. In addition, higher bank charges apply if the full purchase price has to be transferred."
https://www.owlaw.com/german-customs-law/10703-wash-out-cont...

- "The 'washout' value is the additional cost for the buyer to replace the pre-purchased contract grain with current market valued grain."
https://www.graintrade.org.au/sites/default/files/Publicatio...

-"Wash outs are common to all commodity trading. Common reasons for wash outs are a seller's inability to cover, to supply the goods under contract for reasons which cannot be considered "force majeure”.
https://www.btb.termiumplus.gc.ca/tpv2alpha/alpha-eng.html?l...

-"To wash out a Contract is to cancel the transactional arrangement due to various factors determined outside of AgriDigital. 
Once a washout has been agreed upon by the two parties, a user can complete the washout by executing one of the following:..."
https://knowledgebase.agridigital.io/hc/en-us/articles/36000...