H-HS12035PP, H-HS12035E, H-HS12035GK - Panasonic Digital Camera Service Manual (repair manual). Page 12

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1. Blow off the dust first, then sweep out the dust from narrower spaces with soft cleaning brush.
2. Wipe up the Outer casing part with the dry fuzz-free cloth.

Define the location of the dust / dirt first, whether it is outside lens surface or not.

1. When it is outside surface of the lens

When the dust and / or dirt gets on the outer side surface of the Lens glasses, order the following procedures.

a. Blow off the dust on the Lens glass surface with the Blower, gently. (Do not Blow too strongly.)
b. Wipe out the dirt on the lens glass surface with Lens cleaning KIT (VFK1900BK) if necessary.

(Consult the Instruction sheet which is included in the Lens cleaning KIT in details.)
NOTE :
5th lens has the "Nano Surface Coating".
Avoid damage the coating, please clean it with soft dry cloth. (Don't use chemicals)

2. When it is inside of the lens

When there is dust / dirt inside surface of the 1st / 5th lens frame unit, remove it by referring to the following procedures. 

1. When removing the 1st / 5th lens frame unit, it has to be proceed inside of satisfied clean level. 

(Less than class 10,000 (Federal Standard 209D)) 
As for clean box, refer to the "3.2. Clean Box", in details. 

2. When install the screws, use torque driver (RFKZ0456) with specified torque. 
3. To keep the Lens performance, can only use the original 1st/5th lens frame unit . 

So the 1st / 5th lens frame unit is not supplied as spare parts. 
Also do not exchange the 1st / 5th lens  frame unit taking from others.

4. 5th lens has the "Nano Surface Coating".

Avoid damage the coating, please clean it with soft dry cloth. (Don't use chemicals)