Concerning the difference, we will talk about appearance, sanitation and maintenance.
The condition of the area in question will determine which type of cleaning you should employ.
Think of a kitchen sink that has sat with soiled dishes and grease over the weekend. Getting everything cleaned to sanitary conditions would take more work than usual and the result would be satisfactory. However, getting the sink cleaned to the point where it is reflective would require a deep cleaning.
The advantage of a deep cleaning is that the appearance of "factory new" lasts longer in-between regular cleanings.
There are also cases where a deep clean is the only way 4N Cleaning Service can properly disinfect and improve the appearance of an area, such as the toilet pictured below. As you can see, the caulk line is riddled with mildew, the porcelain is not reflective and the handle does not inspire us to touch it with bare hands.
Ultimately, the decision of which type of cleaning; Regular Cleaning Maintenance vs. Deep Cleaning is yours. 4N Cleaning Service will make a recommendation based on the results you desire.