The most popular solution is the division into cleaning zones:
The first zone - it is placed in front of the building in order to remove the largest contaminants - usually rubber entrance mats or aluminum system doormats are used;
The second zone - cleans the shoes of remaining dirt - it is recommended to use laundry entrance mats or aluminum mats with a textile and rubber insert,
The third zone - eliminates minor impurities such as sand, dust and moisture - here an entrance mat that absorbs laundry washing dirt is recommended.