While professional cleaning services don't require high levels of education on the part of employees, the wide range of environments that call for their services necessitates that only those companies with extensive experience succeed.
「在其他先進國家，諸如日本，每一棟大樓必定要在各項設備（包括清潔管理）都能達到標準後，才核發使用執照。」趙石指出，國內也正走向這種管理方式，尤其是清潔範圍龐大，環境特殊的案子，多交由特定的清潔公司長期包攬。