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@Abdullah, some commercial hand wash also create bubble after rinsed and some are not. 

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I think so.. I purchased SLES from other supplier and it is much easier to rinse 

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@ozgirl yup.. its liquid.. because I purchased 70% SLES (paste) and I diluted  with water to produce 20% SLES solution.

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@Fekher, I need your opinion. I want to know is it normal if I only add water, SLES and CAPB based on the recent formulation, but its still form bubble when I rub even after I rinsed my hands for 20 seconds? does it mean something wrong with the SLES and CAPB I purchased???? I asked the supplier but she said I have to rinse until no bubbles appear after rinse. When I asked her, I rinsed my hands for 20 secs then she said she have no idea. 

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@Fekher yup.. Its too low & im worry it may affect the efficiency of this product.. Btw, is it normal after rinse, still got bubble when rub?

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@Fekher, this is the formulations I try today. 

                      Formulation 1      Formulation 2          Formulation 2
Water               q.s. to 100%       q.s. to 100%             q.s. to 100%
NaOH (1M)          0.004%               0.004%                     0.004%
EDTA                     0.5%                   0.5%                         0.5%
SLES (20%)             25.67%               25.67%                    17.12%
CAPB (30%)            4.25%                 4.25%                       2.83%
Propylene glycol     3.6%                   3.6%                         3.6%
Glycerin                    -                        -                              -
Citric acid           until pH6            until pH6                until pH6

Unfortunately even at low concentration of surfactant, it still foaming after rinse. 

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Noted @Fekher.. Thank you @Paprik… I try to increase on preservative as well 

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Hi @Fekher, based on your suggestion, I came up with a numbers of new formulations. Here are the new formulations:

                       Formulation 1    Formulation 2          Formulation 2
Water               q.s. to 100%       q.s. to 100%             q.s. to 100%
NaOH (1M)          0.004%               0.004%                     0.004%
EDTA                     0.5%                   0.5%                         0.5%
SLES (20%)              40%                    40%                          40%
CAPB (30%)              6.6%                  6.6%                        6.6%
DEA                         0.3%                    -                              -
Propylene glycol     3.6%                   3.6%                         3.6%
Glycerin                    -                        -                              1%
Citric acid           until pH6            until pH6                until pH6
Phenoxyethanol      1%                        1%                            1%

All 3 formulations create a acceptable amount of foam. But the main problem is the foam is still there after rinse. Is it cause by high amount of SLES???  

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Thank you for your reply @Fekher.. I will try to reduce DEA and remove glycerin and update the outcome 

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Sorry for the late comment on this discussion. Dear @MurtazaHakim, I also experience the same problem where my hand wash become sticky and still foaming after rinse. My formulation consists of SLES (30%):CAPB (30%):DEA with ratio 4:1:0.5. Although I reduce the ratio to 3:1:0.5, it is still foaming when I rub my hands after rinsed. Do you have any idea why it keeps foaming? Thank you in advance