Biofilm communities can harbor bacteria longer and are very difficult to clean.
生物膜群落容纳细菌的时间更长且很难清洗。
13 car leather leather - waxing fine pores, anything in the infiltration are very difficult to clean out, is a suture met wax in the future can't be washed out.
车内皮件打蜡——真皮类有纤细毛孔，渗进去的任何东西都很难再清洁掉，缝线更是一碰到蜡今后就别想洗得掉。
At the same time, the rain is also mixed with some of the naked eye can not see the dust, after the sun, will be derived from a large number of oxides, time to clean up very difficult to clean.
同时，雨水中还夹杂一些肉眼看不到的灰尘，经过阳光照射后，会衍生出大量的氧化物，时间长了想清理干净非常不易。
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