明年溶剂通过一个过滤器去除林特和不溶性暂停从土壤中的溶剂。大多数过滤器使用一超细网格支持薄薄的过滤器粉（由硅藻土和活性粘土 ） 。某些机器使用powderless过滤器，其中有能力清除土壤颗粒大于30 微米 。
随着时间一薄层滤饼 （所谓的淤泥 ）累积对林特过滤器。该淤泥移除定期（每天） ，然后再处理，以收回溶剂被困在了淤泥。许多机器使用“的附带光盘过滤器”，删除穆克从滤波器的离心力，而这是回到与溶剂清洗。
以提高清洁的权力，少量的洗涤剂 （ 0.5 ％ -1.5 ％ ），加上工作溶剂和对其使用来说必不可少的功能。 这些洗涤剂，帮助解散亲水性土壤和保持土壤从redepositing ，服装。 根据对机器的设计，无论是一阴离子或阳离子洗涤剂的使用方式。
由于溶剂回收小于100 ％ ，因为干洗洗衣机不会删除水基污渍好，企业家制定了湿法清理过程中，主要是冷水洗涤和空气干燥，用电脑控制的洗衣机和干燥机。湿法清理，一般被视为在其起步阶段，虽然低技术版本，它已使用了数百年。
Working solvent from the washing chamber passes through several filtration steps before it is returned to the washing chamber. The first step is a button trap which prevents small objects such as lint, fasteners, buttons, and coins from entering the solvent pump.
Next the solvent passes through a filter which removes lint and insoluble suspended soils from the solvent. Most filters use an ultra fine mesh to support a thin layer of filter powder (made from diatomaceous earth and activated clays). Some machines use powderless filters which are capable of removing soil particles greater than 30 micrometers.
Over time a thin layer of filter cake (called muck) accumulates on the lint filter. The muck is removed regularly (commonly once per day) and then processed to recover solvent trapped in the muck. Many machines use "spin disc filters" which remove the muck from the filter by centrifugal force while it is back washed with solvent.
After the lint filter, the solvent passes through an absorptive cartridge filter. This filter is made from activated clays and charcoal and removes fine insoluble soil and non-volatile residues, along with dyes from the solvent. Finally, the solvent passes through a polishing filter which removes any soil not previously removed. The clean solvent is then returned to the working solvent tank.
To enhance cleaning power, small amounts of detergent (0.5%-1.5%) are added to the working solvent and are essential to its functionality. These detergents help dissolve hydrophilic soils and keep soil from redepositing on garments. Depending on the machine's design, either an anionic or cationic detergent is used.
Since the solvent recovery is less than 100%, and because dry-cleaning doesn't remove water-based stains well, entrepreneurs have developed the wet cleaning process, which is essentially cold-water washing and air drying, using a computer-controlled washer and dryer. Wet cleaning is generally regarded as being in its infancy, although low-tech versions of it have been used for centuries.