Question: What part of my body should I clean when I enter and exit a building?

Answer passage (source: UK):
page_title: Offices and contact centres
section_headers: 5. Cleaning the workplace
section_content: In this section

5.1 Before reopening
5.2 Keeping the workplace clean
5.3 Hygiene: handwashing, sanitation facilities and toilets
5.4 Changing rooms and showers
5.5 Handling goods, merchandise and other materials, and onsite vehicles

5.1 Before reopening
Objective: To make sure that any site or location that has been closed or
partially operated is clean and ready to restart, including:

an assessment for all sites, or parts of sites, that have been closed, before restarting work
carrying out cleaning procedures and providing hand sanitiser before restarting work

Steps that will usually be needed:


Checking whether you need to service or adjust ventilation systems, for example, so that they do not automatically reduce ventilation levels due to lower than normal occupancy levels.


Most air conditioning systems do not need adjustment, however where systems serve multiple buildings or you are unsure, advice can be sought from your heating ventilation and air conditioning (HVAC) engineers or advisers.


Opening windows and doors frequently to encourage ventilation, where possible.


5.2 Keeping the workplace clean
Objective: To keep the workplace clean and prevent transmission by touching
contaminated surfaces.
Steps that will usually be needed:


Frequent cleaning of work areas and equipment between uses, using your usual cleaning products.


Frequent cleaning of objects and surfaces that are touched regularly, such as door handles and keyboards, and making sure there are adequate disposal arrangements.


Clearing workspaces and removing waste and belongings from the work area at the end of a shift.


Limiting or restricting use of high-touch items and equipment, for example, printers or whiteboards.


If you are cleaning after a known or suspected case of COVID-19 then you should refer to the specific guidance.


5.3 Hygiene: handwashing, sanitation facilities and toilets
Objective: To help everyone keep good hygiene through the working day.
Steps that will usually be needed:


Using signs and posters to build awareness of good handwashing technique, the need to increase handwashing frequency, avoid touching your face and to cough or sneeze into a tissue which is binned safely, or into your arm if a tissue is not available.


Providing regular reminders and signage to maintain personal hygiene standards.


Providing hand sanitiser in multiple locations in addition to washrooms.


Setting clear use and cleaning guidance for toilets to ensure they are kept clean and social distancing is achieved as much as possible.


Enhancing cleaning for busy areas.


Providing more waste facilities and more frequent rubbish collection.


Providing hand drying facilities – either paper towels or electrical driers.


5.4 Changing rooms and showers
Objective: To minimise the risk of transmission in changing rooms and showers.
Steps that will usually be needed:


Where shower and changing facilities are required, setting clear use and cleaning guidance for showers, lockers and changing rooms to ensure they are kept clean and clear of personal items and social distancing is achieved as much as possible.


Introducing enhanced cleaning of all facilities regularly during the day and at the end of the day.


5.5 Handling goods, merchandise and other materials, and onsite vehicles
Objective: To reduce transmission through contact with objects that come into
the workplace and vehicles at the worksite.
Steps that will usually be needed:


Cleaning procedures for goods and merchandise entering the site.


Cleaning procedures for vehicles.


Introducing greater handwashing and handwashing facilities for workers handling goods and merchandise and providing hand sanitiser where this is not practical.


Regular cleaning of vehicles that workers may take home.


Restricting non-business deliveries, for example, personal deliveries to workers.


[HVAC]: heating ventilation and air conditioning
  [COVID-19]: coronavirus

Reviewer feedback on this answer:
There is a lot of information here.  It talks about washing hands.  It's a good answer.
Perfectly states the body parts that should be cleaned after contact
This answer the question with a direct answer. This answer give step and guidance on what to do when you enter and exit as well as your day to day.

Reviewer ratings:
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Excellent